Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8ade7fccf727a6…

MALICIOUS

PDF

73.1 KB Created: 2021-02-19 18:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8376e597c7d1a36e811533ec0f20c731 SHA-1: 3aa59af68bc3860532ac9bc6fc7bc3ef33603c98 SHA-256: bd8ade7fccf727a639219bcf449c8e6b95d9445e5d0083fb1875292e5961f811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a PDF SEO link farm, pointing to various PDF files hosted on external domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=benefits+of+technology+in+nursing PDF link annotation
    • https://cdn.sqhk.co/sowodopevew/gAShgjb/kart_racer_game_review.pdfIn PDF document text
    • https://tadizusojad.weebly.com/uploads/1/3/2/7/132712436/kuwudazawobasumitiro.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/hjq0Vgi/65349765224.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/TNKgfuA/25424808249.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/2jfjhkM/download_clash_of_clans_hack_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/ajieE1j/jotemiman.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/iridjgz/dogwood_tree_translate_in_chinese.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/yDicTKl/fun_facts_about_zodiac_sign_aquarius.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/8yidgj3/dewukegajud.pdfIn PDF document text
    • http://jokixulu.iblogger.org/ravaleguximoragusari.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/jjS7qXm/white_horse_running_video_download.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/bzwyjhM/64573078657.pdfIn PDF document text
    • https://fopulowaledini.weebly.com/uploads/1/3/1/6/131637921/7914959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mejobu/video_er_online_url.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/lavujituvivonuvodiroxofa.pdfIn PDF document text
    • http://vimobuzu.epizy.com/88298800192.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/rironulafesovibamofebuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/mipasizixevosagexitasiva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 4964 bytes
SHA-256: 35c4808e9dc01d5c47d7fef4a32da09bc164e2e285ccd74611ceaea5564ca7e7
font_01_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 9924 bytes
SHA-256: 8c60f9285b518110b7fc98e3df4f7a53c73d0a79ba27b35480c82a28f527d318
font_02_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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